Changing themes from the menu bar in PyQt5 GUI

readme.md

Introduction

The ThemeChanger is a PyQt5 Program that can change its background colors to any color. This is one of the ways to change the style of your app.

DEMO

You can find the demo of this program here in my twitter account.

Ok bye bye.

app.py

# -*- coding: utf-8 -*-
# @Author: Climax
# @Date:   2022-08-08 10:30:23
# @Last Modified by:   Climax
# @Last Modified time: 2022-08-08 14:20:54

import sys

from PyQt5.QtWidgets import (QMainWindow, QApplication, QToolBar, QAction)

class MainWindow(QMainWindow):
	

	def __init__(self):
		super().__init__()
		self.setWindowTitle("ThemeChanger")
		self.setFixedSize(500,300)

		button_color_red = QAction("Red", self)
		button_color_red.triggered.connect(self.change_theme_red)

		button_color_green = QAction("Green", self)
		button_color_green.triggered.connect(self.change_theme_green)

		button_color_blue = QAction("Blue", self)
		button_color_blue.triggered.connect(self.change_theme_blue)

		button_color_yellow = QAction("Yellow", self)
		button_color_yellow.triggered.connect(self.change_theme_yellow)

		menu = self.menuBar()
		customize_menu = menu.addMenu("Customize")
		theme_menu = customize_menu.addMenu("themes")

		theme_menu.addAction(button_color_red)
		theme_menu.addAction(button_color_green)
		theme_menu.addAction(button_color_blue)
		theme_menu.addAction(button_color_yellow)


	def change_theme_red(self):
		self.setStyleSheet("QMainWindow {background-color: red}")

	def change_theme_blue(self):
		self.setStyleSheet("QMainWindow {background-color: blue}")

	def change_theme_green(self):
		self.setStyleSheet("QMainWindow {background-color: green}")

	def change_theme_yellow(self):
		self.setStyleSheet("QMainWindow {background-color: yellow}")

app = QApplication(sys.argv)

window = MainWindow()
window.show()
app.exec_()

Forgot to tell that you'll need PyQt5 to run this program. SAYONARA